Remove CarrierBandwidth.

Remove CarrierBandwidth system API. This should have been removed when
LCE system API was added.

Bug: 184396924
Bug: 180434672
Test: atest -c PhoneStateListenerTest
Change-Id: I4d3f9e6f5a62d40cdb193a0f20673a773eb3d8b0
3 files changed